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Catherine was born in Siena and, seeking perfection, entered the Third Order of the Dominicans when she was still in her teens. In 1370 she was commanded by a vision to leave her secluded life and enter the public life of the world. She wrote letters to many major public figures and carried on a long correspondence with Pope Gregory XI, urging him to reform the clergy and the administration of the Papal States. She burned with the love of God and her neighbour. As an ambassador she brought peace and harmony between cities. She fought hard to defend the liberty and rights of the Popes and did much for the renewal of religious life. She also dictated books full of sound doctrine and spiritual inspiration. She died on 29 April 1380. In 1970 Pope Paul VI declared her a Doctor of the Church.

Liturgical colour: white

White is the colour of heaven. Liturgically, it is used to celebrate feasts of the Lord; Christmas and Easter, the great seasons of the Lord; and the saints. Not that you will always see white in church, because if something more splendid, such as gold, is available, that can and should be used instead. We are, after all, celebrating.

In the earliest centuries all vestments were white – the white of baptismal purity and of the robes worn by the armies of the redeemed in the Apocalypse, washed white in the blood of the Lamb. As the Church grew secure enough to be able to plan her liturgy, she began to use colour so that our sense of sight could deepen our experience of the mysteries of salvation, just as incense recruits our sense of smell and music that of hearing. Over the centuries various schemes of colour for feasts and seasons were worked out, and it is only as late as the 19th century that they were harmonized into their present form.